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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
May 23, 2018 | Feb. 28, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Common Partnership Unit [Line Items] |  |  |  |
Dividends, Common Stock |  |  | $ 32.5 |
Dividends payable, date to be paid | Jul. 20, 2018 |  |  |
Dividends payable, date of record | Jul. 06, 2018 |  |  |
Dividend Declared [Member] |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |
Dividends Payable, Amount Per Share | $ 0.18 |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |
Dividends, Common Stock |  | $ 32.5 |  |
Dividends payable, date to be paid |  | Jul. 20, 2018 |  |
Dividends payable, date of record |  | Jul. 06, 2018 |  |
Preferred units authorized |  |  | 20,000,000 | 20,000,000
Preferred units outstanding |  |  | 0 | 0
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dividend Declared [Member] |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |
Dividends Payable, Amount Per Share |  | $ 0.18 |  |

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